Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
831-203 9 Salinas CA 145J TERRA NOVA TELECOM INC. 736   2026-06-04   
831-641 8 Monterey CA 145J TERRA NOVA TELECOM INC. 736   2026-02-05   
831-665 8 Hollister CA 145J TERRA NOVA TELECOM INC. 736   2026-03-13   
831-887 A Monterey CA 145J TERRA NOVA TELECOM INC. 736      

Last updated: Thu, 16 Jul 2026 02:21:55 UTC

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